From a5bf8e5e8b8d36c4bfa7e41f18c40afa03a18161 Mon Sep 17 00:00:00 2001 From: Danielle Ratson Date: Wed, 27 Jul 2022 09:23:24 +0300 Subject: [PATCH] mlxsw: spectrum_ptp: Add implementation for physical hardware clock operations Implement physical hardware clock operations. The main difference between the existing operations of Spectrum-1 and the new operations of Spectrum-2 is the usage of UTC hardware clock instead of FRC. Add support for init() and fini() functions for PTP clock in Spectrum-2. Signed-off-by: Danielle Ratson Signed-off-by: Amit Cohen Reviewed-by: Petr Machata Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- .../ethernet/mellanox/mlxsw/spectrum_ptp.c | 147 ++++++++++++++++++ .../ethernet/mellanox/mlxsw/spectrum_ptp.h | 25 +-- 2 files changed, 162 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c index 04110a12c855..dd7c94dd4c01 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c @@ -339,6 +339,153 @@ void mlxsw_sp1_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock_common) kfree(clock); } +static u64 mlxsw_sp2_ptp_read_utc(struct mlxsw_sp_ptp_clock *clock, + struct ptp_system_timestamp *sts) +{ + struct mlxsw_core *mlxsw_core = clock->core; + u32 utc_sec1, utc_sec2, utc_nsec; + + utc_sec1 = mlxsw_core_read_utc_sec(mlxsw_core); + ptp_read_system_prets(sts); + utc_nsec = mlxsw_core_read_utc_nsec(mlxsw_core); + ptp_read_system_postts(sts); + utc_sec2 = mlxsw_core_read_utc_sec(mlxsw_core); + + if (utc_sec1 != utc_sec2) { + /* Wrap around. */ + ptp_read_system_prets(sts); + utc_nsec = mlxsw_core_read_utc_nsec(mlxsw_core); + ptp_read_system_postts(sts); + } + + return (u64)utc_sec2 * NSEC_PER_SEC + utc_nsec; +} + +static int +mlxsw_sp2_ptp_phc_settime(struct mlxsw_sp_ptp_clock *clock, u64 nsec) +{ + struct mlxsw_core *mlxsw_core = clock->core; + char mtutc_pl[MLXSW_REG_MTUTC_LEN]; + u32 sec, nsec_rem; + + sec = div_u64_rem(nsec, NSEC_PER_SEC, &nsec_rem); + mlxsw_reg_mtutc_pack(mtutc_pl, + MLXSW_REG_MTUTC_OPERATION_SET_TIME_IMMEDIATE, + 0, sec, nsec_rem, 0); + return mlxsw_reg_write(mlxsw_core, MLXSW_REG(mtutc), mtutc_pl); +} + +static int mlxsw_sp2_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + struct mlxsw_sp_ptp_clock *clock = + container_of(ptp, struct mlxsw_sp_ptp_clock, ptp_info); + s32 ppb = scaled_ppm_to_ppb(scaled_ppm); + + /* In Spectrum-2 and newer ASICs, the frequency adjustment in MTUTC is + * reversed, positive values mean to decrease the frequency. Adjust the + * sign of PPB to this behavior. + */ + return mlxsw_sp_ptp_phc_adjfreq(clock, -ppb); +} + +static int mlxsw_sp2_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct mlxsw_sp_ptp_clock *clock = + container_of(ptp, struct mlxsw_sp_ptp_clock, ptp_info); + struct mlxsw_core *mlxsw_core = clock->core; + char mtutc_pl[MLXSW_REG_MTUTC_LEN]; + + /* HW time adjustment range is s16. If out of range, set time instead. */ + if (delta < S16_MIN || delta > S16_MAX) { + u64 nsec; + + nsec = mlxsw_sp2_ptp_read_utc(clock, NULL); + nsec += delta; + + return mlxsw_sp2_ptp_phc_settime(clock, nsec); + } + + mlxsw_reg_mtutc_pack(mtutc_pl, + MLXSW_REG_MTUTC_OPERATION_ADJUST_TIME, + 0, 0, 0, delta); + return mlxsw_reg_write(mlxsw_core, MLXSW_REG(mtutc), mtutc_pl); +} + +static int mlxsw_sp2_ptp_gettimex(struct ptp_clock_info *ptp, + struct timespec64 *ts, + struct ptp_system_timestamp *sts) +{ + struct mlxsw_sp_ptp_clock *clock = + container_of(ptp, struct mlxsw_sp_ptp_clock, ptp_info); + u64 nsec; + + nsec = mlxsw_sp2_ptp_read_utc(clock, sts); + *ts = ns_to_timespec64(nsec); + + return 0; +} + +static int mlxsw_sp2_ptp_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct mlxsw_sp_ptp_clock *clock = + container_of(ptp, struct mlxsw_sp_ptp_clock, ptp_info); + u64 nsec = timespec64_to_ns(ts); + + return mlxsw_sp2_ptp_phc_settime(clock, nsec); +} + +static const struct ptp_clock_info mlxsw_sp2_ptp_clock_info = { + .owner = THIS_MODULE, + .name = "mlxsw_sp_clock", + .max_adj = MLXSW_REG_MTUTC_MAX_FREQ_ADJ, + .adjfine = mlxsw_sp2_ptp_adjfine, + .adjtime = mlxsw_sp2_ptp_adjtime, + .gettimex64 = mlxsw_sp2_ptp_gettimex, + .settime64 = mlxsw_sp2_ptp_settime, +}; + +struct mlxsw_sp_ptp_clock * +mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev) +{ + struct mlxsw_sp_ptp_clock *clock; + int err; + + clock = kzalloc(sizeof(*clock), GFP_KERNEL); + if (!clock) + return ERR_PTR(-ENOMEM); + + clock->core = mlxsw_sp->core; + + clock->ptp_info = mlxsw_sp2_ptp_clock_info; + + err = mlxsw_sp2_ptp_phc_settime(clock, 0); + if (err) { + dev_err(dev, "setting UTC time failed %d\n", err); + goto err_ptp_phc_settime; + } + + clock->ptp = ptp_clock_register(&clock->ptp_info, dev); + if (IS_ERR(clock->ptp)) { + err = PTR_ERR(clock->ptp); + dev_err(dev, "ptp_clock_register failed %d\n", err); + goto err_ptp_clock_register; + } + + return clock; + +err_ptp_clock_register: +err_ptp_phc_settime: + kfree(clock); + return ERR_PTR(err); +} + +void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock) +{ + ptp_clock_unregister(clock->ptp); + kfree(clock); +} + static int mlxsw_sp_ptp_parse(struct sk_buff *skb, u8 *p_domain_number, u8 *p_message_type, diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.h index 87afc96a0ed6..d5871cb4ae50 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.h +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.h @@ -57,6 +57,11 @@ void mlxsw_sp1_get_stats_strings(u8 **p); void mlxsw_sp1_get_stats(struct mlxsw_sp_port *mlxsw_sp_port, u64 *data, int data_index); +struct mlxsw_sp_ptp_clock * +mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev); + +void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock); + struct mlxsw_sp_ptp_state *mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp); void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state); @@ -140,6 +145,16 @@ static inline void mlxsw_sp1_get_stats(struct mlxsw_sp_port *mlxsw_sp_port, { } +static inline struct mlxsw_sp_ptp_clock * +mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev) +{ + return NULL; +} + +static inline void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock) +{ +} + static inline struct mlxsw_sp_ptp_state * mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp) { @@ -151,16 +166,6 @@ static inline void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state) } #endif -static inline struct mlxsw_sp_ptp_clock * -mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev) -{ - return NULL; -} - -static inline void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock) -{ -} - static inline void mlxsw_sp2_ptp_receive(struct mlxsw_sp *mlxsw_sp, struct sk_buff *skb, u16 local_port) {